linux-kernel - Re: [PATCH v3 02/23] x86/numa: Add 'nohmat' option

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Message-ID: <CAPcyv4iUtQ1Edau5e7GQumu1MxcAvorSNwnw9HGhzFDNuBS7=Q@mail.gmail.com>
Date:   Sat, 1 Aug 2020 09:36:48 -0700
From:   Dan Williams <dan.j.williams@...el.com>
To:     Randy Dunlap <rdunlap@...radead.org>
Cc:     Andrew Morton <akpm@...ux-foundation.org>, X86 ML <x86@...nel.org>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        "H. Peter Anvin" <hpa@...or.com>,
        Vishal L Verma <vishal.l.verma@...el.com>,
        Ard Biesheuvel <ard.biesheuvel@...aro.org>,
        Linux MM <linux-mm@...ck.org>,
        linux-nvdimm <linux-nvdimm@...ts.01.org>,
        Joao Martins <joao.m.martins@...cle.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Linux ACPI <linux-acpi@...r.kernel.org>,
        Maling list - DRI developers 
        <dri-devel@...ts.freedesktop.org>
Subject: Re: [PATCH v3 02/23] x86/numa: Add 'nohmat' option

On Fri, Jul 31, 2020 at 8:51 PM Randy Dunlap <rdunlap@...radead.org> wrote:
>
> On 7/31/20 8:25 PM, Dan Williams wrote:
> > Disable parsing of the HMAT for debug, to workaround broken platform
> > instances, or cases where it is otherwise not wanted.
> >
> > ---
> >  arch/x86/mm/numa.c       |    2 ++
> >  drivers/acpi/numa/hmat.c |    8 +++++++-
> >  include/acpi/acpi_numa.h |    8 ++++++++
> >  3 files changed, 17 insertions(+), 1 deletion(-)
> >
> > diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
> > index 87c52822cc44..f3805bbaa784 100644
> > --- a/arch/x86/mm/numa.c
> > +++ b/arch/x86/mm/numa.c
> > @@ -41,6 +41,8 @@ static __init int numa_setup(char *opt)
> >               return numa_emu_cmdline(opt + 5);
> >       if (!strncmp(opt, "noacpi", 6))
> >               disable_srat();
> > +     if (!strncmp(opt, "nohmat", 6))
> > +             disable_hmat();
>
> Hopefully that will be documented in
> Documentation/x86/x86_64/boot-options.rst.

Sorry, yes, you gave that feedback before. I can do a quick respin
with this and the kbuild-robot compile fixups.